Combined drill-bit-holding chuck and front cylinder-head for rock-drilling engines.



J. G. LEYNER. COMBINED DR ILL BIT HOLDING CHUCK AND FRONT CYLINDER HEADFOR ROCK DRILLING ENGINES.

APPLICATION FILED AUG. 15, 1911. 1'

1,124,627, Patented Jan. 12, 1915.

J. G. LEYNER.

COMBINED DRILL BIT HOLDING GIIUGK AND FRONT CYLINDER HEAD FOR ROCKDRILLING ENGINES.

APPLICATION FILED AUG. 15, 1911.

Patented Jan. 12, 1915.

2 SHEETS-SHEET 2.

Ju \\s I IIIIIII 57/ n III,

U ITED STATES PATENT OFFICE.

JOHN GEORGE LEYNER, 01? DENVER, COLORADO.

COMBINED DRILL-BIT-HOLDING CHUCK AND FRONT CYLINDER-HEAD FOR ROCK-DRILLING ENGINES.

Specification of Letters Patent.

Application filedAugustlfi, 1911. Serial No. 644,152.

and State of Colorado, have invented anew' and useful CombinedDrill-Bit-Holdmg Chuck and Front Drilling Engines, a specification.

My inventlon relates to improvements in C linder-Head for Rockof whichthe following is combined drill bit holding chuck and front cylinderheads for rock drilling engines, and the objects of my invention are:firstto provide a combined drill bit holding chuck and front cylinderhead, which is adapted to be connected to the cylinders of rock drillingengines by any suitable means, but preferably by. yielding connectionswhich give. under longitudinal strain, "said head being provided withand adapted to support a rotary drill holding chuck which is rotated bydrilling engine; and second-toprovide a tubular front cylinder headforrock drilling engines, adapted to support a hammer piston. operateddrill bit .holding chuck which is adapted to support a rock cuttingdrill bit in such a manner that it can be instantaneously inserted inand withdrawn frorn'the' chuck portion of the front cylinder'head'by thehand of an operator, and

that is arranged to support the drill bit so that 'anintermittent stepby step rotative movement can be imparted to itby-the reciprocatingmovements of the piston hammerand the rifle bar and ratchet toothedthrough the combined mechanism of rock drilling engines. I attain theseobjects by the mechanism i;llustrated-"in the accompanying drawings, in

which:v Figure 1 is a longitudinal, sectional view drill bit holdingchuck portion of the front head, the drill bit being omitted. Fig. 2 isa similar yiew showing the drill bit in the chuck. Fig. 3 is alongitudinal, sectional view of the chuck portion ofthe fro'nt cylinderhead. Fig." 4' is an end view'ofthe same. Flg. 5 front view of the drillbit locking mug.

is a Fig. 6- is 'a' front view of "the fluted chuck .nut. Fig. 7 isafront view of thechuck ring. Fig. 8Kis-a front view of the chuckbushing. Fig. 9 is a fragmentary 'plan view made-on smaller scalethanFigs. 1,, 2 and 11, and showing the housings of the'sprmgs of thehammer piston of the v tiverock drilling engine.

vention con the side rods in section. Fig. 10 is a front view of thecylinder head cap. Fig. 11 is- 11, showing the water inlet hoseconnected to'the rear cylinder head. Fig. 13 is a side Patented Jan.12,1915.

view of the rifle bar, the ratchet ring being 5 shown in sectlon inconnection. therewith;

and. Fig. 14 is an 'end view of the rifle'bar and ratchetring, the riflebar being partly broken away for clearer illustration.

Similar letters of reference refer to simi lar partsthroughout theseveral views.

Referrlng to the drawings: The numeral -.1 designates the cylinder headportion ofmy'combined drill bit holdingchuck and front cylinder which isadapted as a front cylmder head for the cylinders of rock drillingengines. The rear end portion 2 ofthis cylinder head portion 1 isadapted to enter the front end portion of a cylinder 3, a

fragment of which I illustrate in Fig. 1, to show the coeperativerelation of my front does not form a part ofmy present invention, butcoeperates withit, together with cylinder head to-it. This cylinder,however, I

other features which I have illustrated and will describe hereinafter,to make an opera- A projecting annular or circumferential lug or collar4, which is arranged to form a shoulder, is formed. around the cylinderhead adjacent to its rear end '2, which is adapted to bear against theend of a cyl-' inder, while the extreme rear end extends into the rearend of the cylinder and extends to a cylinder ring 5. This frontcylinder head is in the form of a. tubular shaped casing, and adjacentto its front end against this lug. I The cap may be secured to the endof the cylinder by any suitable means, but I preferably use side bolts8, as

shown in Fig.9, which: extend through two lugs'9, which are providedwith apertures 10, through which the bolts pass to the cylinder,- asshown in Fig-10; but my inplates any suitable means for .no'rtion anannular projecting lug or.col-' la'r portion 6 is 'formed. A cap 7extends over' the front end of. the cylinder head 30 bores.

securing the cylinder head to the cylinder, and also. any suitable Wayof securing the cap 'to the end of the cylinder.

The ends of the bolts extend beyond the cap and an expansive spring 11is mounted on each bolt between the head of the bolt and the side lug ofthe cap, which is provided with recesses 12, into which the springsextend, and theybear against the bottmu'wall of the recesses in the cap,as

shown in Fig. 9. These side bolts extend along the sides of the cylinderto its op'po site end or head, and they clamp the front cylinder head tothe cylinder and at the 15 same time clamp the cap to the front end ofthe front cylinder head witha resilient clamping pressure. This frontcylinder head is provided with a straight cylindrical bore in which asleeve 13 is rotatably mounted. 2a This sleeve 13 I term the chucksleeve. This chuck sleeve is provided with an axial bore of twodifferent diameters, which are both independent from the sleeve 13, itcan be made integral .with the sleeve if desired, but facilitates theassembling and taking apart of the chuck when made-separate from thesleeve.

.5 40 The entrance to the rear end of the chuck sleeve is threaded, anda nut 18, which I term a chuck nut, is threaded to it. This nut 18 is'provided with an axial bore in the wall of 'which straight rifle flutes19 are formed. ring 20, which I term the chuck "ring,-'i's-'placed inthe bore 14, between the chuck "nut and-the chuck bushing form ofcylinder head and chuck is adapted to a hammer piston 21 for driving therock cutting drill bit 22, and this hammer piston is provided with anextension 23, which I term the hammer bar extension, thesurface 7 ofwhich is provided with straight rifled flutes 24, which are arranged andadapted tofit reciprocally in the straight rifled flutes of the chucknut 18. t

The axial aperture through the chuck ring 20 is enough larger than theend of the hammer piston bar to extend loosely I around its end whichextends. through the chuck nut in it'to close to the'adjacent end of thechuck bushing sleeve 17 but does not strike it, asthe shoulder .at theunction of the hammer bar and the piston head ortion 65 of the hammerpistonis rounded an is ar- 17. This.

ranged to strike against the front cylinder ring 5, the corner of whichis also rounded. My improved cylinder head anrfit chuck J is arrangedand adapted to hold and to drive rock cutting drill bits of differentlength and sizes and of any suitable type or'character and arrangementof rock cutting lips, and my invention contemplates the use of adr1llbit holding chuck adapted to receive and to hold a drill bit in such aposition in the reciprocal path of the hammer piston that it will bedriven thereby to operatively drill holes in rock when properlypositioned in operative relation thereto. I preferably, however, use thetype and. char acter of drill bit 22, illustrated in Figs. 2 and 11.This drill .bit comprises a shank portion 25, which is provided with anaxial aperture 26, which extends-through it' from end to end. Thisaperture'26 is made large.

enough to permit the shankend 25 of the drill bit to fit loosely overthe forward end of a water conveying inlet tube 28, which projectsthrough the hammer piston from the rear end of a drilling engine.

The drill bit. is provided at a short distance from its shank end with apair of projecting lugs 29, which I term locking lugs.

These lugs are formed on diametrically opposite sides of the shank endof the drill bit and are arranged and adapted to form shoulderedportions on the shank that areused in connection with the chuck ring tosecure the drill bit to the drilling engine.

I preferably arrange the drill bit holding chuckportion of my frontcylinder head in the following manner: The front end of the cap 7 isprovided with an axial aperture 30,

- which is made large enough topermit the shankends of rock cuttingdrill bits to be inserted loosely into and through it into a ring 31,which 1 term the key ring. This key ring is placed within the capbetween its end head and the end of the sleeve 13, and it is keyedloosel against rotative movement to the end of t e sleeve by projectinglugs 32., that are formed on the key ring and are adapted to fit intorecesses 33 formed in the adjacent end of the sleeve to receive them.The key ring 31 is thus removably secured to the end ofthe chuck sleevewithin the cap of the front cylinder head, but. so as to rotate withsaidsleeve. Thisfkey ring 31v comprises a hardened steel ring that isprovided with a-central axial aperture 34, which is large enough indiameter to' permit the shank end of the drill bit to fit loosely in it.y

This central aperture is extended on twof'of its opposite side portionsby straight lateral slot portions35 which extend far enough beyond thediameter of the central round portion to rmit the lugs 29 of the shankof the drill it to pass loosely through them.

The bore 15 ofthe sleeve 13 is provided on oppositesides inwardlyprojecting I the drill bit after entering it through the key ring intothe aperture in the end f'the chuck sleeve, the lugs-29 engage the sidesof the lug-keys 36, and the drill bit-1s locked againstrotation in onedirection, and the rotative movement of the chuck sleeve theopposite-direction holds the drill bit lugs against these lug keys36-and out of alinement with the entrance aperture in the key ring, andthus prevents the drill'bit from working accidentally out of the chuck,and it can only be withdrawn therefrom by turn-' ing it so its lugs arein alinement with the lug receiving apertures of the key ring.

The lugs 29 of the drill bit have a longitudinal movement on the lugkeys of the sleeve, of preferably about three-quarters of an inch, whilethe terminal end of the shank of the drill extends beyond that portionof the chuck sleeve in which the. lugs are held into and through thefront bushing and into the reciprocal path of the hammer piston toreceive the 'full force of the reciprocal blows of the hammer piston andstill have a compensating feed movement forward into rock when the feedscrew is rotated to hold the drill-bit against the rock the lug Fig. 11,shows a rock drilling engine in holding portion of the chuck of aboutthreequa'r'ters of an inch.

- 'In- Fig. 11 I have illustrated my improved combined drill bitholding'chuck and cy-linder head 'operatively connected to a rockdrilling engine such as. is embodied in my perliscligig application No.570,339, filed July The rock drilling engine illustrated in which airand water are commingled together and fed to the rock cutting point ofthe drill bit, and it consists of a number of elements that do not forma part of my presentiinvention, but they cooperate with m presentinvention to form a complete roc 'd'rilling engine, but as thesefeatures are is f r d i th walls of the cylinser and fully, describedinthat application, they will be only briefly referred to in this appeation. These features consist of the cylmcler 3, which is provided witha valve chest 38, in which a valve 39 is reciprocally mounted. .The op.osite ends of the valve chest are provided bore 11, and an. operativesystem of orts valve chest' A compressed air or other actuatlng fluidinlet aperture 43, isffqr 'e'd in the cylinder in which'a valve 44,13operatively seated. A swiveling air inlet elbow 45, 1s threadedlysecured tothe opposite side .of'the airinlet aperture from the handle46, of the inlet with removable plugs' 1 A0. The cylinder is providedwith asuitabl end ofrthe hollow drill -bit'22.

. The rifleba-r comprises ahead portion 66,

valve 44, which is arranged to be connected to one end of a hose47, onlya fragment of which is shown, but which is adapted to .extend to asupply of' compressed air or other suitable actuating fluid.

The cylinder isprovided with a counterbore 48, at its rear end, in whicha ring 49, which I term a cylinder-ring, is seated.

This cylinder ring is provided in its. pe-

riphery with a packing ring 50-, to prevent leakage of air past thecylinder ring from the bore of the cylinder. a p

The piston haimner 21, is reciprocally. mounted inthe bore of thecylinder and its rear end is provided with an axial aperture, in which aspirally fluted nut 52, is secured. A smaller axial aperture 53 is alsoformed entirely through the piston hammer, through which the waterfeeding tube 28, e xtends, as

will be fully explained hereinafter.

cylinder is provided with-a rear cylinder head 54:, which, together withthe front cyl- The Y inder head, is clamped to the opposite ends of thecylinder by resilient tension bolts 8, which extend throughproje'ctingportions 9.

and ,55, and are providedwith springs 11, p as shown in Fig. 9, thesebol ts being arranged in an operative manner to clamp the cylinderheadsand the.cylinder together; The rear cylinder head 5a, is providedwith a water inlet aperture 56., to which one end of a short piece ofhose 57, is attached and in which a valve-58, is placed adjacent to headand closed by a cap 61. The. axial bore in the rear cylinder head isprovided-with parts 62, 63 and 64, which are provided, to-

gether with the rear cylinder head, with axial'apertures into which oneend of the water conveying tube 28, projects, and the parts 62, 63 and64 are arranged to clampingly hold the endof the-pipe 28, in a rigid butreleasable position in the axial center of the rear cylinder head, fromwhich it pro- 7 jects, and it is arranged'to extend loosely rough; theaxial. center of the rifle bar 65 d loosely through the axial aperture53, m the; piston hammer 21, into a the shank thatrfits .rotatably'in aring mounted in a head,"and a stem portion 68, that projects from thehead portionthrough" the cylinder counterbore 67, formed in the rearcylinder spirally arranged rifle flutes 69, that are arrangedto meshloosely into and slide freely in the fluted nut of the piston hammer,into the axial bore of which the rifle bar'e'x-- tends from the rearcylinder head; the piston hammer being arranged to reci rocate freely onthe spiral flutes of the rifle ar.

The head portion 66 of the rifle bar is with a. plurality of spring pawldogs 72, the

springs 73 of which hold the pawls in operative engaging relation to theteeth of the ratchet ring. This ratchet rin -and the rifle bar are shownin Figs. '13 an 14.

The rifle bar is provided with an axial aperture 7 3 which is madeenough larger in diameter than the water conveying tube 28, to permitthe rifle bar to rotate freely on the water conveyingtube which projects"from the rear cylinder head loosely through it.

The cylinder is provided with slideways 74, and is slidably mounted inguideways 75, formed in a shell 76, which is provided with a hub 77 thatis adapted to be clamped by a chuck toa mine column. I do not illustratethis chuck or the mine-column, as they do not form a part of my presentinvention. The cylinder is also provided with a depending nut portion78, which is threaded, and a feed screw 79 is rotatablymounted on theshell and is threaded to the nut in such a manner that when the feedscrew is turned by a crank handle 80, with which it is provided, thecylinder is" fed slidably forward or backivardin the guideways of theshell. a

The general operation of the drilling engin'e is as follows: Compressedair is admitted tothe valve chest and valve by the inlet valve andrecipro'cates the hammer };iston,-which strikes against the end of thedrill bit. The reciprocating strokes of the hammer piston on the riflebar and in the nut '18 of the chuck sleeve 13, impart through the mediumof the pawls and ratchet ring, a step by step rotary movement to thedrill bit. Water is turned into the rear cylinder head through the waterinlet valve 58, and flows through the tube 28, onto the end of thehollow drill bit where air I from the cylinder which also enters the endof the drill bit, mingles with it and discharges as a jet or spray fromthe end of the drill bit, into the bottom of holes in rock whiledrilling them.

While I have illustrated my improved combined drill bitholding chuck andfront cylinder head'attached to a particular type of rock drillingengine, I do not wishto be limited to the application of it to that typeof drilling engine, and furthermore I do not wish to be limited to theexact construction of the drill holding chuck and cylinder head shown,as many changes might be made without departing from the spirit of myinvention and the scope of the appended claim.

Having described. my invention, what I claim as new and desire to secureby Letters Patent is: p

In a rock drilling-engine, a cylinder, a combined drill-bitholdin'grhuckand front cylinder-head, a cylindrical casing and a capsleeves key portion, said drill bit being-provided with a shank endportion adapted to fit loosely in said sleeve, and with pro ectinglocking lugs adapted to pass freely through said ring andabut againstthe key portions of said sleeve, and a bushing insaid sleeve arranged todefine the clearance movement of said drill bits locking lugs 1n theclearance space of said sleeve.

In testimony whereof I aflix my signature inpresence of two witnesses.

JOHN GEORGE LEYNER.

Witnesses:

G. SARGENT ELLIoTr, Emzannrrr SMITH.

